#define _CRT_SECURE_NO_WARNINGS 1
#include<iostream>
using namespace std;
void swap(int& a, int& b)
{
	int tmp = a;
	a = b;
	b = tmp;
}
int main()
{
	int a = 9;
	int b = 5;
	swap(a, b);
	cout << a << " " << b << endl;
	return 0;
}